KochiKame

The typical KochiKame plot involves Kankichi "Ryo-san" Ryotsu coming up with a money-making scheme by inventing a new gadget or capitalizing on a fad, achieving great success, calling on Keiichi Nakagawa's help as things turn sour, and finally losing it all as the fad runs out of steam or out of control. While the plots are gag-driven, much of the humor comes from the combination of mundane characters with those that are bizarrely out of place; such as Nakagawa who has wealth and Ai Asato who is a transsexual. What they have in common is everyone's lack of actual police work, most of which is never explained or rationalized in the slightest. (It is explained in Jump that Ryo-san is one of the best officers at catching criminals.) Nakagawa and Reiko Akimoto have special licenses (such as for wearing personal clothes instead of uniforms to work) from police headquarters because of their skills in linguistics.

The plot consistently evolved with the times and most of the main characters do not really age, despite the fact that the series started in the 1970s and is later clearly set in the 2010s. However, some characters do age, like the grandchild of Buchao, who was a baby in the early books, but is now close to junior high, which the author has self-mocked in a few "look back" episodes.